Implement initial chrome.browserAction.openPopup API.

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
index a17f3d8cde36d18dbab3e47d97209012f9400896..cdc9840e3e99f1cbd433b45ce140e7d7500ae48b 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm
@@ -140,6 +140,10 @@ const CGFloat kBrowserActionBubbleYOffset = 3.0;
 // Handles when the given BrowserActionButton object is clicked.
 - (void)browserActionClicked:(BrowserActionButton*)button;
 
+// Triggers opening the popup window for an extension without a user action.
+// Used by an extension API that opens an extension's popup.
+- (void)openPopup:(const Extension*)extension;
+
 // Returns whether the given extension should be displayed. Only displays
 // incognito-enabled extensions in incognito mode. Otherwise returns YES.
 - (BOOL)shouldDisplayBrowserAction:(const Extension*)extension;
@@ -238,6 +242,14 @@ class ExtensionServiceObserverBridge : public content::NotificationObserver,
     [owner_ resizeContainerAndAnimate:NO];
   }
 
+  virtual void BrowserActionShowPopup(const Extension* extension) OVERRIDE {
+    content::WebContents* active_tab =
+        browser_->tab_strip_model()->GetActiveWebContents();
+    if (!active_tab)
+      return;
+    [owner_ openPopup:extension];
+  }
+
  private:
   // The object we need to inform when we get a notification. Weak. Owns us.
   BrowserActionsController* owner_;
@@ -739,6 +751,26 @@ class ExtensionServiceObserverBridge : public content::NotificationObserver,
   }
 }
 
+- (void)openPopup:(const Extension*)extension {
+  const GURL popupUrl = toolbarModel_->GetPopupUrl(extension, browser_);
+  if (!popupUrl.is_empty()) {
+    NSPoint arrowPoint = [self popupPointForBrowserAction:extension];
+    if (NSEqualPoints(arrowPoint, NSZeroPoint)) {
+      // The button is hidden if arrowPoint is zero.
+
+      // TODO(justinlin): This is not right.. position below hotdog menu.
+      arrowPoint = NSMakePoint(NSWidth([containerView_ frame]),
+                               kBrowserActionOriginYOffset);
+    }
+
+    [ExtensionPopupController showURL:popupUrl
+                            inBrowser:browser_
+                           anchoredAt:arrowPoint
+                        arrowLocation:info_bubble::kTopRight
+                              devMode:NO];
+  }
+}
+
 - (void)browserActionClicked:(BrowserActionButton*)button {
   const Extension* extension = [button extension];
   GURL popupUrl;